Improvement in saw-rung machines



3 Sheets--Sheet1.

G. BL YTH E.

Improvement in Saw-Filing Machines.

No. 133,194. Patented NOVJQJQTZ" AM PHOTO-117110684 Pun: caum'ssomss Pmcrsij 3 Sheets-=Sheet 2 G. BLYTHE. improvement in Saw-Filing Machines. No. 133,194. Patented Nov.19,1872.

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3 Sheets--Sheet 3.

G. BLYTHE;

Improvement in Saw-Filing Machines. N0. 133,194. v Patented Nov.19,1872.

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GEORGE BLYTHE, OF OHILLIGOTHE, MISSOURI.

IMPROVEMENT lN SAW-HUNG MACHlNES.

Specification forming part of Letters Patent N 0. 133,194, dated November 19, 1872.

To all whom it may concern:

Be it known that I, GEORGE BLYTHE, of Chi1licothe,in the county of Livingston and State of Missouri, have invented a new and valuable Improvement in Saw Filing Machines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had tothe annexed drawing making a part of thisspecification, and to the letters and figures of reference 111 arked thereon.

Figure 1 of the drawing is a representation Referring to the accompanying drawing, A.

A designate the ends or legs of the filingi'raine, held together by long bolts, B. These bolts have two nuts at each end-one inside and the other outside the end of the frame. The nuts hold the parts A A together rigidly, but allow the same to be adjusted to any required distance apart. The tops of the ends A have arms a, which extend back and are recessed toform bearings for a feeding-screw,

' a, which may be operated by a crank on one end of its shaft or by gearing properly arranged and connected therewith. Gaps a are put over the journals of the screw and secured to the arms a by means of bolts of. The sawelamp is secured to the front part of the filingframe, and consists of two parallel bars or jaws, B,.secured together, and capable of the necessaryadj ustment. O designates the guidebearer, so termed because it supports all the guides. The back part of the guide-bearer has an internally threaded box,through which the feeding-screw Works, and thereby moves the guidebearer laterally. The upper part of said box, marked d, is'cast with the guidebea-rer, and has ears d. The lower part, marked 11 is separate, and is provided also with ears d through which pass screws E, connecting the two arts together. Midway between its ends t e sides E of the guidebearer are extended laterally, and are con 'structed with recessed elevations or arches F to receive the saw-clamp, as shown, the inner or under surfaces of the arches resting firmly on said clamp. G represents notches in said arches to let the latter pass over the teeth of the saw. H represents horizontal parallel plates, elevated at the ends of the guide-bearer, and arranged with their upper surfaces exactly on a line with each other. At the ends of these plates longitudinal slots I are out, and at the middle part of each a hole, I, is formed. The slots hold bolts J having rectangular heads, corresponding to longitudinal grooves in the file-bar, and may be shifted, when necessary, to the holes I. L represents the file-bar, consisting of along bar having grooves or slots M extending from each end to near the middle part. heads fit these grooves. Then two of the bolts are placed in the holes I, and the fileba-r adjusted to them, the file cuts the edges of the teeth straight across; butwhen the bar is adjusted diagonally and upon two bolts arranged, respectively, at opposite ends and on opposite sides of the guidebearer, the file cuts the edges obliquely or to a bevel. The nature of the bevel is governed by the positions to which the rectangular-headed bolts are adjusted. K' designates the file, and K K the file-holders. The latter are bolts having fiat heads, through which round holes are bored to hold the stern and point of the file. The holes are made round so that the file may be set to cut teeth of any desired pitch. The bolt or file-holder K receives the stem of the file and passes through a longitudinal slot, K in the file-bar, which allows it to be adjusted to any length of file in order to secure the same in a rigid manner. The holder K passes through a hole in the filebar. Both holders are provided with thumb-nuts m on their upper ends, and are adjustable vertically by meansthereof in order that the file may be adjusted to the proper position, the adjustment being high or low according to the length of the teeth of the saw. The holder K must be lowered below the holder K to compensate for the tapering form of the file. The threads 7.

The rectan gular bolt 2 rearea on the shank of the holders work through nuts m on the under side of the file-bar. The filebar is made narrow at its middle part, so that the file may be seen at work by the operator.

In filing, thefile is fed from one tooth to the other by means of the feed-screw. The file travels from the handle toward the point of the saw, and vice .versa. When the teeth have beveled edges the file, while traveling in one direction, passes to every other tooth; but when the teeth are straight-edged the file passes from one tooth to the next. The file must of course be raised in passing from tooth to tooth. The operation may be accomplished by simply lifting the file-bar and then turning the feed-screw a sufficient distance, or it may be accomplished by lifting the guide-holder,

which is arranged to turn on the feed-screw as on a hinge.

N designates a contrivance for gaging or sizing the teeth. It consists of a bent or U- shaped metallic device pivoted to a stem which passes through one side of the guide-holder, and which is adjustable and held at any point by means of a set-screw, O, as shown. The gage is placed above the saw-clamp. The stem has a slot or channel in its lower part to let the saw-edge pass.

The operation of the gage is as follows; The filing is commenced at the side of the machine nearestthe gage, the guide-bearer being moved as close to this side as maybe required. The pivoted piece 12 is now raised. One or more teeth are then'finished, and the piece 02 let down so that its forward end shall lie in the bottom of the angular notch between two teeth. Now, according as the remaining teeth are successively finished, and the guideholder moved, the piece a rises from one notch and falls into the next, and in this way gages all the teeth to a uniform size with those first cut. The file-bar is operated by taking hold of both ends and running it to and fro in the direction of its length. When the teeth are beveled the file-bar must of course be shifted from one set of rectangular bolts to the other during 1. The gage N, in combination with the setscrew 0, substantially as specified.

2. In a saw-filing machine, the laterally-adjustable guide-beam E holding the file-bar L, in combination with the feed-screw a substantially as specified.

3. The laterally-adjustable hinged guide beam, constructed and arranged substantially as specified.

4. The slotted file-bar L, in combination with the slotted plates H and rectangularheaded guide-bolts J, substantially as-specified.

5. The tooth-gage N having the hinged selfadjusting device it, and arranged substantially as specified.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

GEORGE BLYTHE.

"Witnesses J. G. MINTEER, 0. B. SMITH. 

